Device and method for measuring instantaneous pneumatic pulse permeability of low-permeability rock

A technology of air pressure pulse and measuring device, which is applied in the direction of measuring device, instrument, surface/boundary effect, etc., can solve the problems that have not yet been researched, and achieve the effect of simple operation, reliable result and intuitive display

Active Publication Date: 2013-08-14
WUHAN UNIV
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Problems solved by technology

However, at present, there is no gas permeation device with transient pressure pulse method in China to study the permeability measurement of low-permeability rocks under different confining pressure conditions.

Method used

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  • Device and method for measuring instantaneous pneumatic pulse permeability of low-permeability rock
  • Device and method for measuring instantaneous pneumatic pulse permeability of low-permeability rock
  • Device and method for measuring instantaneous pneumatic pulse permeability of low-permeability rock

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specific Embodiment approach

[0025] Step 1, sampling and loading. A 50mm×100mm standard rock sample was drilled, baked continuously in an oven at 105° for 24 hours, and then cooled in a vacuum cooling tower for 24 hours. After that, the rubber sleeve 17 can be put into the sample loading. In order to ensure the sealing of the sample loading, the specific loading of the sample is as follows: figure 2 shown.

[0026] Step 2, apply confining pressure. After sample loading is completed, close the second hydraulic valve 5, the seventh hydraulic valve 24, and the eighth hydraulic valve 26 in sequence, then open the first hydraulic valve 2 and the ninth hydraulic valve 27 in sequence, and fill the pressure chamber 39 with hydraulic oil to drive away The air inside the pressure chamber 39. The hydraulic oil returns to the high-pressure oil tank 1 through the pipeline circuit, indicating that the pressure chamber 39 is full, and the ninth hydraulic valve 27 and the first hydraulic valve 2 are closed accordingl...

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Abstract

The invention relates to a device and method for measuring instantaneous pneumatic pulse permeability of low-permeability rock. The device comprises a confining pressure servo system, a pneumatic servo system and a data acquisition and processing system, wherein the confining pressure servo system can apply 0 to 60MPa of confining pressure to the lateral side of a low-permeability rock sample; the pneumatic servo system consists of an air injection system and an air permeating system; the air injection system can provide 0.1 to 10MPa of high-purity nitrogen; the air permeating system can conduct air permeation tests of two different ranges on a pipeline loop and a steel cylinder loop; and the data acquisition and processing system can real-timely acquire pressure of the rock sample at an inlet and outlet loops, and can be used for drawing a pressure-time curve of the inlet and outlet loops, automatically calculating the permeability of the rock sample, storing and displaying the result. The measurement device provided by the invention can perform permeability measurement tests of rock materials, especially low-permeability rocks, under different confining pressures, has the advantages of simpleness in operation and reliable result, and can display result visually.

Description

technical field [0001] The invention belongs to the technical field of rock mass seepage and seepage-stress coupling, and in particular relates to a low-permeability rock transient pressure pulse permeability measurement device and a measurement method suitable for different confining pressure conditions. Background technique [0002] The study of the permeability of low-permeability rocks is of great significance to the development of low-permeability oil and gas fields, underground energy storage, underground storage of greenhouse gases, gas drainage from high-gas mines, and geological disposal of radioactive waste. However, due to the long time of permeability test of low-permeability rocks, the difficulty of sealing, high precision requirements, and susceptibility to environmental influences, the current experimental research on low-permeability rocks at home and abroad is far from meeting the needs of engineering construction and safety assessment. . The indoor test me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/04
Inventor 陈益峰胡少华魏凯胡冉周创兵
Owner WUHAN UNIV
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